source3/libsmb/libsmb_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SMB client library implementation
   4    Copyright (C) Andrew Tridgell 1998
   5    Copyright (C) Richard Sharpe 2000, 2002
   6    Copyright (C) John Terpstra 2000
   7    Copyright (C) Tom Jansen (Ninja ISD) 2002
   8    Copyright (C) Derrell Lipman 2003-2008
   9    Copyright (C) Jeremy Allison 2007, 2008
  10    Copyright (C) SATOH Fumiyasu <fumiyas@osstech.co.jp> 2009.
  11
  12    This program is free software; you can redistribute it and/or modify
  13    it under the terms of the GNU General Public License as published by
  14    the Free Software Foundation; either version 3 of the License, or
  15    (at your option) any later version.
  16
  17    This program is distributed in the hope that it will be useful,
  18    but WITHOUT ANY WARRANTY; without even the implied warranty of
  19    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20    GNU General Public License for more details.
  21
  22    You should have received a copy of the GNU General Public License
  23    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  24 */
  25
  26 #include "includes.h"
  27 #include "libsmbclient.h"
  28 #include "libsmb_internal.h"
  29 #include "../librpc/gen_ndr/ndr_lsa.h"
  30 #include "rpc_client/cli_pipe.h"
  31 #include "rpc_client/cli_lsarpc.h"
  32 #include "libcli/security/security.h"
  33
  34 /*
  35  * Check a server for being alive and well.
  36  * returns 0 if the server is in shape. Returns 1 on error
  37  *
  38  * Also useable outside libsmbclient to enable external cache
  39  * to do some checks too.
  40  */
  41 int
  42 SMBC_check_server(SMBCCTX * context,
  43                   SMBCSRV * server)
  44 {
  45         socklen_t size;
  46         struct sockaddr addr;
  47
  48         size = sizeof(addr);
  49         return (getpeername(server->cli->fd, &addr, &size) == -1);
  50 }
  51
  52 /*
  53  * Remove a server from the cached server list it's unused.
  54  * On success, 0 is returned. 1 is returned if the server could not be removed.
  55  *
  56  * Also useable outside libsmbclient
  57  */
  58 int
  59 SMBC_remove_unused_server(SMBCCTX * context,
  60                           SMBCSRV * srv)
  61 {
  62         SMBCFILE * file;
  63
  64         /* are we being fooled ? */
  65         if (!context || !context->internal->initialized || !srv) {
  66                 return 1;
  67         }
  68
  69         /* Check all open files/directories for a relation with this server */
  70         for (file = context->internal->files; file; file = file->next) {
  71                 if (file->srv == srv) {
  72                         /* Still used */
  73                         DEBUG(3, ("smbc_remove_usused_server: "
  74                                   "%p still used by %p.\n",
  75                                   srv, file));
  76                         return 1;
  77                 }
  78         }
  79
  80         DLIST_REMOVE(context->internal->servers, srv);
  81
  82         cli_shutdown(srv->cli);
  83         srv->cli = NULL;
  84
  85         DEBUG(3, ("smbc_remove_usused_server: %p removed.\n", srv));
  86
  87         smbc_getFunctionRemoveCachedServer(context)(context, srv);
  88
  89         SAFE_FREE(srv);
  90         return 0;
  91 }
  92
  93 /****************************************************************
  94  * Call the auth_fn with fixed size (fstring) buffers.
  95  ***************************************************************/
  96 void
  97 SMBC_call_auth_fn(TALLOC_CTX *ctx,
  98                   SMBCCTX *context,
  99                   const char *server,
 100                   const char *share,
 101                   char **pp_workgroup,
 102                   char **pp_username,
 103                   char **pp_password)
 104 {
 105         fstring workgroup;
 106         fstring username;
 107         fstring password;
 108         smbc_get_auth_data_with_context_fn auth_with_context_fn;
 109
 110         strlcpy(workgroup, *pp_workgroup, sizeof(workgroup));
 111         strlcpy(username, *pp_username, sizeof(username));
 112         strlcpy(password, *pp_password, sizeof(password));
 113
 114         /* See if there's an authentication with context function provided */
 115         auth_with_context_fn = smbc_getFunctionAuthDataWithContext(context);
 116         if (auth_with_context_fn)
 117         {
 118             (* auth_with_context_fn)(context,
 119                                      server, share,
 120                                      workgroup, sizeof(workgroup),
 121                                      username, sizeof(username),
 122                                      password, sizeof(password));
 123         }
 124         else
 125         {
 126             smbc_getFunctionAuthData(context)(server, share,
 127                                               workgroup, sizeof(workgroup),
 128                                               username, sizeof(username),
 129                                               password, sizeof(password));
 130         }
 131
 132         TALLOC_FREE(*pp_workgroup);
 133         TALLOC_FREE(*pp_username);
 134         TALLOC_FREE(*pp_password);
 135
 136         *pp_workgroup = talloc_strdup(ctx, workgroup);
 137         *pp_username = talloc_strdup(ctx, username);
 138         *pp_password = talloc_strdup(ctx, password);
 139 }
 140
 141
 142 void
 143 SMBC_get_auth_data(const char *server, const char *share,
 144                    char *workgroup_buf, int workgroup_buf_len,
 145                    char *username_buf, int username_buf_len,
 146                    char *password_buf, int password_buf_len)
 147 {
 148         /* Default function just uses provided data.  Nothing to do. */
 149 }
 150
 151
 152
 153 SMBCSRV *
 154 SMBC_find_server(TALLOC_CTX *ctx,
 155                  SMBCCTX *context,
 156                  const char *server,
 157                  const char *share,
 158                  char **pp_workgroup,
 159                  char **pp_username,
 160                  char **pp_password)
 161 {
 162         SMBCSRV *srv;
 163         int auth_called = 0;
 164
 165         if (!pp_workgroup || !pp_username || !pp_password) {
 166                 return NULL;
 167         }
 168
 169 check_server_cache:
 170
 171         srv = smbc_getFunctionGetCachedServer(context)(context,
 172                                                        server, share,
 173                                                        *pp_workgroup,
 174                                                        *pp_username);
 175
 176         if (!auth_called && !srv && (!*pp_username || !(*pp_username)[0] ||
 177                                      !*pp_password || !(*pp_password)[0])) {
 178                 SMBC_call_auth_fn(ctx, context, server, share,
 179                                   pp_workgroup, pp_username, pp_password);
 180
 181                 /*
 182                  * However, smbc_auth_fn may have picked up info relating to
 183                  * an existing connection, so try for an existing connection
 184                  * again ...
 185                  */
 186                 auth_called = 1;
 187                 goto check_server_cache;
 188
 189         }
 190
 191         if (srv) {
 192                 if (smbc_getFunctionCheckServer(context)(context, srv)) {
 193                         /*
 194                          * This server is no good anymore
 195                          * Try to remove it and check for more possible
 196                          * servers in the cache
 197                          */
 198                         if (smbc_getFunctionRemoveUnusedServer(context)(context,
 199                                                                         srv)) {
 200                                 /*
 201                                  * We could not remove the server completely,
 202                                  * remove it from the cache so we will not get
 203                                  * it again. It will be removed when the last
 204                                  * file/dir is closed.
 205                                  */
 206                                 smbc_getFunctionRemoveCachedServer(context)(context,
 207                                                                             srv);
 208                         }
 209
 210                         /*
 211                          * Maybe there are more cached connections to this
 212                          * server
 213                          */
 214                         goto check_server_cache;
 215                 }
 216
 217                 return srv;
 218         }
 219
 220         return NULL;
 221 }
 222
 223 /*
 224  * Connect to a server, possibly on an existing connection
 225  *
 226  * Here, what we want to do is: If the server and username
 227  * match an existing connection, reuse that, otherwise, establish a
 228  * new connection.
 229  *
 230  * If we have to create a new connection, call the auth_fn to get the
 231  * info we need, unless the username and password were passed in.
 232  */
 233
 234 static SMBCSRV *
 235 SMBC_server_internal(TALLOC_CTX *ctx,
 236             SMBCCTX *context,
 237             bool connect_if_not_found,
 238             const char *server,
 239             const char *share,
 240             char **pp_workgroup,
 241             char **pp_username,
 242             char **pp_password,
 243             bool *in_cache)
 244 {
 245         SMBCSRV *srv=NULL;
 246         char *workgroup = NULL;
 247         struct cli_state *c;
 248         struct nmb_name called, calling;
 249         const char *server_n = server;
 250         struct sockaddr_storage ss;
 251         int tried_reverse = 0;
 252         int port_try_first;
 253         int port_try_next;
 254         int is_ipc = (share != NULL && strcmp(share, "IPC$") == 0);
 255         uint32 fs_attrs = 0;
 256         const char *username_used;
 257         NTSTATUS status;
 258         char *newserver, *newshare;
 259
 260         zero_sockaddr(&ss);
 261         ZERO_STRUCT(c);
 262         *in_cache = false;
 263
 264         if (server[0] == 0) {
 265                 errno = EPERM;
 266                 return NULL;
 267         }
 268
 269         /* Look for a cached connection */
 270         srv = SMBC_find_server(ctx, context, server, share,
 271                                pp_workgroup, pp_username, pp_password);
 272
 273         /*
 274          * If we found a connection and we're only allowed one share per
 275          * server...
 276          */
 277         if (srv &&
 278             *share != '\0' &&
 279             smbc_getOptionOneSharePerServer(context)) {
 280
 281                 /*
 282                  * ... then if there's no current connection to the share,
 283                  * connect to it.  SMBC_find_server(), or rather the function
 284                  * pointed to by context->get_cached_srv_fn which
 285                  * was called by SMBC_find_server(), will have issued a tree
 286                  * disconnect if the requested share is not the same as the
 287                  * one that was already connected.
 288                  */
 289
 290                 /*
 291                  * Use srv->cli->desthost and srv->cli->share instead of
 292                  * server and share below to connect to the actual share,
 293                  * i.e., a normal share or a referred share from
 294                  * 'msdfs proxy' share.
 295                  */
 296                 if (srv->cli->cnum == (uint16) -1) {
 297                         /* Ensure we have accurate auth info */
 298                         SMBC_call_auth_fn(ctx, context,
 299                                           srv->cli->desthost,
 300                                           srv->cli->share,
 301                                           pp_workgroup,
 302                                           pp_username,
 303                                           pp_password);
 304
 305                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 306                                 errno = ENOMEM;
 307                                 cli_shutdown(srv->cli);
 308                                 srv->cli = NULL;
 309                                 smbc_getFunctionRemoveCachedServer(context)(context,
 310                                                                             srv);
 311                                 return NULL;
 312                         }
 313
 314                         /*
 315                          * We don't need to renegotiate encryption
 316                          * here as the encryption context is not per
 317                          * tid.
 318                          */
 319
 320                         status = cli_tcon_andx(srv->cli, srv->cli->share, "?????",
 321                                                *pp_password,
 322                                                strlen(*pp_password)+1);
 323                         if (!NT_STATUS_IS_OK(status)) {
 324                                 errno = map_errno_from_nt_status(status);
 325                                 cli_shutdown(srv->cli);
 326                                 srv->cli = NULL;
 327                                 smbc_getFunctionRemoveCachedServer(context)(context,
 328                                                                             srv);
 329                                 srv = NULL;
 330                         }
 331
 332                         /* Determine if this share supports case sensitivity */
 333                         if (is_ipc) {
 334                                 DEBUG(4,
 335                                       ("IPC$ so ignore case sensitivity\n"));
 336                         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 337                                 DEBUG(4, ("Could not retrieve "
 338                                           "case sensitivity flag: %s.\n",
 339                                           cli_errstr(c)));
 340
 341                                 /*
 342                                  * We can't determine the case sensitivity of
 343                                  * the share. We have no choice but to use the
 344                                  * user-specified case sensitivity setting.
 345                                  */
 346                                 if (smbc_getOptionCaseSensitive(context)) {
 347                                         cli_set_case_sensitive(c, True);
 348                                 } else {
 349                                         cli_set_case_sensitive(c, False);
 350                                 }
 351                         } else {
 352                                 DEBUG(4,
 353                                       ("Case sensitive: %s\n",
 354                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 355                                         ? "True"
 356                                         : "False")));
 357                                 cli_set_case_sensitive(
 358                                         c,
 359                                         (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 360                                          ? True
 361                                          : False));
 362                         }
 363
 364                         /*
 365                          * Regenerate the dev value since it's based on both
 366                          * server and share
 367                          */
 368                         if (srv) {
 369                                 srv->dev = (dev_t)(str_checksum(srv->cli->desthost) ^
 370                                                    str_checksum(srv->cli->share));
 371                         }
 372                 }
 373         }
 374
 375         /* If we have a connection... */
 376         if (srv) {
 377
 378                 /* ... then we're done here.  Give 'em what they came for. */
 379                 *in_cache = true;
 380                 goto done;
 381         }
 382
 383         /* If we're not asked to connect when a connection doesn't exist... */
 384         if (! connect_if_not_found) {
 385                 /* ... then we're done here. */
 386                 return NULL;
 387         }
 388
 389         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 390                 errno = ENOMEM;
 391                 return NULL;
 392         }
 393
 394         make_nmb_name(&calling, smbc_getNetbiosName(context), 0x0);
 395         make_nmb_name(&called , server, 0x20);
 396
 397         DEBUG(4,("SMBC_server: server_n=[%s] server=[%s]\n", server_n, server));
 398
 399         DEBUG(4,(" -> server_n=[%s] server=[%s]\n", server_n, server));
 400
 401 again:
 402
 403         zero_sockaddr(&ss);
 404
 405         /* have to open a new connection */
 406         if ((c = cli_initialise()) == NULL) {
 407                 errno = ENOMEM;
 408                 return NULL;
 409         }
 410
 411         if (smbc_getOptionUseKerberos(context)) {
 412                 c->use_kerberos = True;
 413         }
 414
 415         if (smbc_getOptionFallbackAfterKerberos(context)) {
 416                 c->fallback_after_kerberos = True;
 417         }
 418
 419         if (smbc_getOptionUseCCache(context)) {
 420                 c->use_ccache = True;
 421         }
 422
 423         c->timeout = smbc_getTimeout(context);
 424
 425         /*
 426          * Force use of port 139 for first try if share is $IPC, empty, or
 427          * null, so browse lists can work
 428          */
 429         if (share == NULL || *share == '\0' || is_ipc) {
 430                 port_try_first = 139;
 431                 port_try_next = 445;
 432         } else {
 433                 port_try_first = 445;
 434                 port_try_next = 139;
 435         }
 436
 437         c->port = port_try_first;
 438
 439         status = cli_connect(c, server_n, &ss);
 440         if (!NT_STATUS_IS_OK(status)) {
 441
 442                 /* First connection attempt failed.  Try alternate port. */
 443                 c->port = port_try_next;
 444
 445                 status = cli_connect(c, server_n, &ss);
 446                 if (!NT_STATUS_IS_OK(status)) {
 447                         cli_shutdown(c);
 448                         errno = ETIMEDOUT;
 449                         return NULL;
 450                 }
 451         }
 452
 453         if (!cli_session_request(c, &calling, &called)) {
 454                 cli_shutdown(c);
 455                 if (strcmp(called.name, "*SMBSERVER")) {
 456                         make_nmb_name(&called , "*SMBSERVER", 0x20);
 457                         goto again;
 458                 } else {  /* Try one more time, but ensure we don't loop */
 459
 460                         /* Only try this if server is an IP address ... */
 461
 462                         if (is_ipaddress(server) && !tried_reverse) {
 463                                 fstring remote_name;
 464                                 struct sockaddr_storage rem_ss;
 465
 466                                 if (!interpret_string_addr(&rem_ss, server,
 467                                                            NI_NUMERICHOST)) {
 468                                         DEBUG(4, ("Could not convert IP address "
 469                                                   "%s to struct sockaddr_storage\n",
 470                                                   server));
 471                                         errno = ETIMEDOUT;
 472                                         return NULL;
 473                                 }
 474
 475                                 tried_reverse++; /* Yuck */
 476
 477                                 if (name_status_find("*", 0, 0,
 478                                                      &rem_ss, remote_name)) {
 479                                         make_nmb_name(&called,
 480                                                       remote_name,
 481                                                       0x20);
 482                                         goto again;
 483                                 }
 484                         }
 485                 }
 486                 errno = ETIMEDOUT;
 487                 return NULL;
 488         }
 489
 490         DEBUG(4,(" session request ok\n"));
 491
 492         status = cli_negprot(c);
 493
 494         if (!NT_STATUS_IS_OK(status)) {
 495                 cli_shutdown(c);
 496                 errno = ETIMEDOUT;
 497                 return NULL;
 498         }
 499
 500         username_used = *pp_username;
 501
 502         if (!NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 503                                                *pp_password,
 504                                                strlen(*pp_password),
 505                                                *pp_password,
 506                                                strlen(*pp_password),
 507                                                *pp_workgroup))) {
 508
 509                 /* Failed.  Try an anonymous login, if allowed by flags. */
 510                 username_used = "";
 511
 512                 if (smbc_getOptionNoAutoAnonymousLogin(context) ||
 513                     !NT_STATUS_IS_OK(cli_session_setup(c, username_used,
 514                                                        *pp_password, 1,
 515                                                        *pp_password, 0,
 516                                                        *pp_workgroup))) {
 517
 518                         cli_shutdown(c);
 519                         errno = EPERM;
 520                         return NULL;
 521                 }
 522         }
 523
 524         status = cli_init_creds(c, username_used,
 525                                 *pp_workgroup, *pp_password);
 526         if (!NT_STATUS_IS_OK(status)) {
 527                 errno = map_errno_from_nt_status(status);
 528                 cli_shutdown(c);
 529                 return NULL;
 530         }
 531
 532         DEBUG(4,(" session setup ok\n"));
 533
 534         /* here's the fun part....to support 'msdfs proxy' shares
 535            (on Samba or windows) we have to issues a TRANS_GET_DFS_REFERRAL
 536            here before trying to connect to the original share.
 537            cli_check_msdfs_proxy() will fail if it is a normal share. */
 538
 539         if ((c->capabilities & CAP_DFS) &&
 540                         cli_check_msdfs_proxy(ctx, c, share,
 541                                 &newserver, &newshare,
 542                                 /* FIXME: cli_check_msdfs_proxy() does
 543                                    not support smbc_smb_encrypt_level type */
 544                                 context->internal->smb_encryption_level ?
 545                                         true : false,
 546                                 *pp_username,
 547                                 *pp_password,
 548                                 *pp_workgroup)) {
 549                 cli_shutdown(c);
 550                 srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 551                                 newserver, newshare, pp_workgroup,
 552                                 pp_username, pp_password, in_cache);
 553                 TALLOC_FREE(newserver);
 554                 TALLOC_FREE(newshare);
 555                 return srv;
 556         }
 557
 558         /* must be a normal share */
 559
 560         status = cli_tcon_andx(c, share, "?????", *pp_password,
 561                                strlen(*pp_password)+1);
 562         if (!NT_STATUS_IS_OK(status)) {
 563                 errno = map_errno_from_nt_status(status);
 564                 cli_shutdown(c);
 565                 return NULL;
 566         }
 567
 568         DEBUG(4,(" tconx ok\n"));
 569
 570         /* Determine if this share supports case sensitivity */
 571         if (is_ipc) {
 572                 DEBUG(4, ("IPC$ so ignore case sensitivity\n"));
 573         } else if (!NT_STATUS_IS_OK(cli_get_fs_attr_info(c, &fs_attrs))) {
 574                 DEBUG(4, ("Could not retrieve case sensitivity flag: %s.\n",
 575                           cli_errstr(c)));
 576
 577                 /*
 578                  * We can't determine the case sensitivity of the share. We
 579                  * have no choice but to use the user-specified case
 580                  * sensitivity setting.
 581                  */
 582                 if (smbc_getOptionCaseSensitive(context)) {
 583                         cli_set_case_sensitive(c, True);
 584                 } else {
 585                         cli_set_case_sensitive(c, False);
 586                 }
 587         } else {
 588                 DEBUG(4, ("Case sensitive: %s\n",
 589                           (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 590                            ? "True"
 591                            : "False")));
 592                 cli_set_case_sensitive(c,
 593                                        (fs_attrs & FILE_CASE_SENSITIVE_SEARCH
 594                                         ? True
 595                                         : False));
 596         }
 597
 598         if (context->internal->smb_encryption_level) {
 599                 /* Attempt UNIX smb encryption. */
 600                 if (!NT_STATUS_IS_OK(cli_force_encryption(c,
 601                                                           username_used,
 602                                                           *pp_password,
 603                                                           *pp_workgroup))) {
 604
 605                         /*
 606                          * context->smb_encryption_level == 1
 607                          * means don't fail if encryption can't be negotiated,
 608                          * == 2 means fail if encryption can't be negotiated.
 609                          */
 610
 611                         DEBUG(4,(" SMB encrypt failed\n"));
 612
 613                         if (context->internal->smb_encryption_level == 2) {
 614                                 cli_shutdown(c);
 615                                 errno = EPERM;
 616                                 return NULL;
 617                         }
 618                 }
 619                 DEBUG(4,(" SMB encrypt ok\n"));
 620         }
 621
 622         /*
 623          * Ok, we have got a nice connection
 624          * Let's allocate a server structure.
 625          */
 626
 627         srv = SMB_MALLOC_P(SMBCSRV);
 628         if (!srv) {
 629                 cli_shutdown(c);
 630                 errno = ENOMEM;
 631                 return NULL;
 632         }
 633
 634         ZERO_STRUCTP(srv);
 635         srv->cli = c;
 636         srv->dev = (dev_t)(str_checksum(server) ^ str_checksum(share));
 637         srv->no_pathinfo = False;
 638         srv->no_pathinfo2 = False;
 639         srv->no_nt_session = False;
 640
 641 done:
 642         if (!pp_workgroup || !*pp_workgroup || !**pp_workgroup) {
 643                 workgroup = talloc_strdup(ctx, smbc_getWorkgroup(context));
 644         } else {
 645                 workgroup = *pp_workgroup;
 646         }
 647         if(!workgroup) {
 648                 return NULL;
 649         }
 650
 651         /* set the credentials to make DFS work */
 652         smbc_set_credentials_with_fallback(context,
 653                                            workgroup,
 654                                            *pp_username,
 655                                            *pp_password);
 656
 657         return srv;
 658 }
 659
 660 SMBCSRV *
 661 SMBC_server(TALLOC_CTX *ctx,
 662                 SMBCCTX *context,
 663                 bool connect_if_not_found,
 664                 const char *server,
 665                 const char *share,
 666                 char **pp_workgroup,
 667                 char **pp_username,
 668                 char **pp_password)
 669 {
 670         SMBCSRV *srv=NULL;
 671         bool in_cache = false;
 672
 673         srv = SMBC_server_internal(ctx, context, connect_if_not_found,
 674                         server, share, pp_workgroup,
 675                         pp_username, pp_password, &in_cache);
 676
 677         if (!srv) {
 678                 return NULL;
 679         }
 680         if (in_cache) {
 681                 return srv;
 682         }
 683
 684         /* Now add it to the cache (internal or external)  */
 685         /* Let the cache function set errno if it wants to */
 686         errno = 0;
 687         if (smbc_getFunctionAddCachedServer(context)(context, srv,
 688                                                 server, share,
 689                                                 *pp_workgroup,
 690                                                 *pp_username)) {
 691                 int saved_errno = errno;
 692                 DEBUG(3, (" Failed to add server to cache\n"));
 693                 errno = saved_errno;
 694                 if (errno == 0) {
 695                         errno = ENOMEM;
 696                 }
 697                 SAFE_FREE(srv);
 698                 return NULL;
 699         }
 700
 701         DEBUG(2, ("Server connect ok: //%s/%s: %p\n",
 702                 server, share, srv));
 703
 704         DLIST_ADD(context->internal->servers, srv);
 705         return srv;
 706 }
 707
 708 /*
 709  * Connect to a server for getting/setting attributes, possibly on an existing
 710  * connection.  This works similarly to SMBC_server().
 711  */
 712 SMBCSRV *
 713 SMBC_attr_server(TALLOC_CTX *ctx,
 714                  SMBCCTX *context,
 715                  const char *server,
 716                  const char *share,
 717                  char **pp_workgroup,
 718                  char **pp_username,
 719                  char **pp_password)
 720 {
 721         int flags;
 722         struct sockaddr_storage ss;
 723         struct cli_state *ipc_cli = NULL;
 724         struct rpc_pipe_client *pipe_hnd = NULL;
 725         NTSTATUS nt_status;
 726         SMBCSRV *srv=NULL;
 727         SMBCSRV *ipc_srv=NULL;
 728
 729         /*
 730          * Use srv->cli->desthost and srv->cli->share instead of
 731          * server and share below to connect to the actual share,
 732          * i.e., a normal share or a referred share from
 733          * 'msdfs proxy' share.
 734          */
 735         srv = SMBC_server(ctx, context, true, server, share,
 736                         pp_workgroup, pp_username, pp_password);
 737         if (!srv) {
 738                 return NULL;
 739         }
 740         server = srv->cli->desthost;
 741         share = srv->cli->share;
 742
 743         /*
 744          * See if we've already created this special connection.  Reference
 745          * our "special" share name '*IPC$', which is an impossible real share
 746          * name due to the leading asterisk.
 747          */
 748         ipc_srv = SMBC_find_server(ctx, context, server, "*IPC$",
 749                                    pp_workgroup, pp_username, pp_password);
 750         if (!ipc_srv) {
 751
 752                 /* We didn't find a cached connection.  Get the password */
 753                 if (!*pp_password || (*pp_password)[0] == '\0') {
 754                         /* ... then retrieve it now. */
 755                         SMBC_call_auth_fn(ctx, context, server, share,
 756                                           pp_workgroup,
 757                                           pp_username,
 758                                           pp_password);
 759                         if (!*pp_workgroup || !*pp_username || !*pp_password) {
 760                                 errno = ENOMEM;
 761                                 return NULL;
 762                         }
 763                 }
 764
 765                 flags = 0;
 766                 if (smbc_getOptionUseKerberos(context)) {
 767                         flags |= CLI_FULL_CONNECTION_USE_KERBEROS;
 768                 }
 769                 if (smbc_getOptionUseCCache(context)) {
 770                         flags |= CLI_FULL_CONNECTION_USE_CCACHE;
 771                 }
 772
 773                 zero_sockaddr(&ss);
 774                 nt_status = cli_full_connection(&ipc_cli,
 775                                                 global_myname(), server,
 776                                                 &ss, 0, "IPC$", "?????",
 777                                                 *pp_username,
 778                                                 *pp_workgroup,
 779                                                 *pp_password,
 780                                                 flags,
 781                                                 Undefined);
 782                 if (! NT_STATUS_IS_OK(nt_status)) {
 783                         DEBUG(1,("cli_full_connection failed! (%s)\n",
 784                                  nt_errstr(nt_status)));
 785                         errno = ENOTSUP;
 786                         return NULL;
 787                 }
 788
 789                 if (context->internal->smb_encryption_level) {
 790                         /* Attempt UNIX smb encryption. */
 791                         if (!NT_STATUS_IS_OK(cli_force_encryption(ipc_cli,
 792                                                                   *pp_username,
 793                                                                   *pp_password,
 794                                                                   *pp_workgroup))) {
 795
 796                                 /*
 797                                  * context->smb_encryption_level ==
 798                                  * 1 means don't fail if encryption can't be
 799                                  * negotiated, == 2 means fail if encryption
 800                                  * can't be negotiated.
 801                                  */
 802
 803                                 DEBUG(4,(" SMB encrypt failed on IPC$\n"));
 804
 805                                 if (context->internal->smb_encryption_level == 2) {
 806                                         cli_shutdown(ipc_cli);
 807                                         errno = EPERM;
 808                                         return NULL;
 809                                 }
 810                         }
 811                         DEBUG(4,(" SMB encrypt ok on IPC$\n"));
 812                 }
 813
 814                 ipc_srv = SMB_MALLOC_P(SMBCSRV);
 815                 if (!ipc_srv) {
 816                         errno = ENOMEM;
 817                         cli_shutdown(ipc_cli);
 818                         return NULL;
 819                 }
 820
 821                 ZERO_STRUCTP(ipc_srv);
 822                 ipc_srv->cli = ipc_cli;
 823
 824                 nt_status = cli_rpc_pipe_open_noauth(
 825                         ipc_srv->cli, &ndr_table_lsarpc.syntax_id, &pipe_hnd);
 826                 if (!NT_STATUS_IS_OK(nt_status)) {
 827                         DEBUG(1, ("cli_nt_session_open fail!\n"));
 828                         errno = ENOTSUP;
 829                         cli_shutdown(ipc_srv->cli);
 830                         free(ipc_srv);
 831                         return NULL;
 832                 }
 833
 834                 /*
 835                  * Some systems don't support
 836                  * SEC_FLAG_MAXIMUM_ALLOWED, but NT sends 0x2000000
 837                  * so we might as well do it too.
 838                  */
 839
 840                 nt_status = rpccli_lsa_open_policy(
 841                         pipe_hnd,
 842                         talloc_tos(),
 843                         True,
 844                         GENERIC_EXECUTE_ACCESS,
 845                         &ipc_srv->pol);
 846
 847                 if (!NT_STATUS_IS_OK(nt_status)) {
 848                         errno = SMBC_errno(context, ipc_srv->cli);
 849                         cli_shutdown(ipc_srv->cli);
 850                         return NULL;
 851                 }
 852
 853                 /* now add it to the cache (internal or external) */
 854
 855                 errno = 0;      /* let cache function set errno if it likes */
 856                 if (smbc_getFunctionAddCachedServer(context)(context, ipc_srv,
 857                                                              server,
 858                                                              "*IPC$",
 859                                                              *pp_workgroup,
 860                                                              *pp_username)) {
 861                         DEBUG(3, (" Failed to add server to cache\n"));
 862                         if (errno == 0) {
 863                                 errno = ENOMEM;
 864                         }
 865                         cli_shutdown(ipc_srv->cli);
 866                         free(ipc_srv);
 867                         return NULL;
 868                 }
 869
 870                 DLIST_ADD(context->internal->servers, ipc_srv);
 871         }
 872
 873         return ipc_srv;
 874 }